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xen: branch for v6.0-rc7

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Merge tag 'for-linus-6.0-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fix from Juergen Gross:
 "A single fix for an issue in the xenbus driver (initialization of
  multi-page rings for Xen PV devices)"

* tag 'for-linus-6.0-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/xenbus: fix xenbus_setup_ring()
This commit is contained in:
Linus Torvalds 2022-09-23 08:31:24 -07:00
commit 526e826285
1 changed files with 6 additions and 3 deletions
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9
drivers/xen/xenbus/xenbus_client.c
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@ -382,9 +382,10 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
unsigned long ring_size = nr_pages * XEN_PAGE_SIZE;
grant_ref_t gref_head;
unsigned int i;
void *addr;
int ret;
*vaddr = alloc_pages_exact(ring_size, gfp | __GFP_ZERO);
addr = *vaddr = alloc_pages_exact(ring_size, gfp | __GFP_ZERO);
if (!*vaddr) {
ret = -ENOMEM;
goto err;
@ -401,13 +402,15 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
unsigned long gfn;
if (is_vmalloc_addr(*vaddr))
gfn = pfn_to_gfn(vmalloc_to_pfn(vaddr[i]));
gfn = pfn_to_gfn(vmalloc_to_pfn(addr));
else
gfn = virt_to_gfn(vaddr[i]);
gfn = virt_to_gfn(addr);
grefs[i] = gnttab_claim_grant_reference(&gref_head);
gnttab_grant_foreign_access_ref(grefs[i], dev->otherend_id,
gfn, 0);
addr += XEN_PAGE_SIZE;
}
return 0;